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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6b4526a3c033dc811e436026f66c847f4071ec497a206e5decc14019b6df86' 
  AND token = 'fF/y0Xvc8MIUxMj48PrMpcsvTAL3uMihW2eI0Nx3Uxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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