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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912c81079b35d2d3efb92373342f80120fe4063911e440b479982ed5ff28151e' 
  AND token = '9yaxuZullJMXNnxSLyER/FAEUY8EoEXUY/JlEe3gNR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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