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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71c5dd6ff324367a42a076ffe39a86a672e0ac64b3c733a8d0c609ab7f12f41' 
  AND token = 'YqaitzUNI+yZhzO3d5tNdt8Qet4GgvRjAdGGvPx7vLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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