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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81bd8971803c32a1db29580606d850bf6ac58e208ff54120c98e5ce22c3b811' 
  AND token = 'eYM39NXizXk3ljd65F2SOze8RK0Pft/a7u9Bbib1rx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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