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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5f344fa30821928732fe2fd8b26e6e6af55920544e0015125f39853a59bc2e' 
  AND token = 'ijjl9n+NihcjzayeY+wSzL6SK2+OcbJgklPUESK5UME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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