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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5e47daa4f85a660302c0dc4902168831f724204a0775eb58a54c4339d5c61e' 
  AND token = 'BsHI/faY5hHn38kTXDYFe4a53UGOiAB719/AbSoUSNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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