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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902232547b84d6c4eb2935d332ce125457f10433e45a1c16055184966cabe900' 
  AND token = 'bH4wzHGzhV9TAibmcuCWQU5iwvAMHjkIQzyQmTiBpHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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