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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3319de8db4476c2c514e441e611a19c14d5060456f12bb04ae54c587ef42df1' 
  AND token = 'B1o/6ixsKEiWO5Uhg+nYGxvcJ2V5+O4O8QtnkyTCRec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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