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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2eb59394bd83edae099167b00107ab32bb2a670571baa7cb518a922f6e2b6d4' 
  AND token = 'zv9EF8QrmSENa3cmcOm3NP0Oo3hGetzH/I0bHy3EPCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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