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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd7c6bd51ca7c2a365bcae300a31e11419229f158c3818fae41d66198326d62' 
  AND token = 'bDfAA4IqQ9q1rA+jNXt4CDaA76sdB1rSovVD76Kg7gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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