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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95f5ec4ed462b350dfd1e26d152b1b6e2e890028417fb2925bec855cc252144' 
  AND token = '4Fz4WILtYtrNqW2RUxB0sN5QEvXch7EXAgERatY2G+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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