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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d37c12c9d8ce9423bbc1b2cdfc81f51ef8750ed6b0a69f6afe0dd57ad3c2ef1' 
  AND token = '4S4tKfIzuEtfE1uKQ08+JTgkRv4ptf3tuYoi/EEY5Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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