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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8d07a7f7c2c6a028807885d63c8dbc4ec5f5eabe084383f7f072066c2d77d1' 
  AND token = 'nYVRH4mV6VoOkV+xJkQCP1VS0s+hjPrsL3Dn0pr6XeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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