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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1276617c4d029e9ed2c42f0b4f6c2aac587d455fa7c55640a1414cc3e315787c' 
  AND token = '2Nn61ky1bY3LFJBAkqv82Pt0tehmJU1sWmQzzyvkJdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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