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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecef894cae3f7cc1c6f4094f4179ce6c052895754834268e1ed7992cea909c8' 
  AND token = 'RqJaf/7keFtu/mTTl0C5bl4XfH5CmuIHzljNDECz2/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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