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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd456cd7ec8a1827dfd3c42f1eb1a2f96ce8629e4e9ebaa393e3005ecc3c799' 
  AND token = 'uSaInTF+1IslwOwkmozfqtYCDDqc1/euDgNX5s35dWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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