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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfe3ecc302b068e452bed4ecbb8eaf3efa6e73342cc506b20aff289770576e8' 
  AND token = '0NKX9l/ax6R3rDYD69GcdBq8i+iZ7sBY96djbcfGaIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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