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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec23797ebb21a883b69c3e8e6db5a4a76771039fac3a2c000f7286b41077caa8' 
  AND token = 'RT5d4vMwLxf5bAXI+5fuf7+vzferfj6S1Otm/MnDrrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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