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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295449788af4156b7e5331564df62617b65d1deaf06cecf51c635313892ef33a' 
  AND token = 'LjRPcl66U/uPl+ETzac/ud/KPYcgw9crz92tCASGNAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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