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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dbc473c5e10f83502b9f392563fc75d1a3662a9149a85f0e24e0396419d055' 
  AND token = 'g83Z7SLL7uvvo2oinJpngGoARQ8GP6iTenc7oEQ0qEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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