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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5f78ef591608530cf2d5ddf9210fb480e1e7c9577607ffab27bc6220f68c8c' 
  AND token = 'u2gc2IlWIuV+v0entPzxjjg+ovFo6U/d+ipJMiY4tPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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