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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a946af79308b285cc61a874956989395c84f7a709a127f874b6d23ef2d74ba' 
  AND token = 'Gs638V0KguGnDFMUNqd4DFR3mFdgjpINQMsO0B2JGlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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