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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0b9ce057968cc46e35367b1c324bd7ac4a80e832a289f3a7f3be26cc79f65a' 
  AND token = 'kiLsAOros8Pa8o6WktgeRokoJva2wpKNu/NZNxsPI+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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