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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0abba0b844b3429ad0b8db49c09130d4e1663cb703e1105c026d25bd72e83437' 
  AND token = 'YtbgOiB9cRMYkfxReOZxaz1+Jeq22fdRWjM0Pf4pK5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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