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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ca7f98bfc6df51d4a63ea0f8902834235a90da1387c86803d31dbe6113bf4a' 
  AND token = 'zAAXprZH/KJXRaZhQrMMYlcSSvebG0wMLrgZarZ4cz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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