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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c46da54c3270a3fe0b4322582aadbc965ad592eca07b987de91ca545839ea0' 
  AND token = 'YdMuGJuAhGS1jA12Bcurfl0or9pS70V6Z2OEr9Pwy6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}