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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40086ce36c8a3975d0923fba6957bbe6b08e9a8784fdbb883a81cddbf92f7a2' 
  AND token = 'iUK+vnEokOD7o1raLimcB7y0GLYC9wSDU/qP1TrjG1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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