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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6e6250a6f0f5fd3ca6b064cae175c64f48227b8b1513b067524271d6590ae7' 
  AND token = 'Hmtd+o/wu5mbZXZ6Jk0GqbpEHXX1xjytr0wPA7fGfV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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