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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90753ac344c2f88f432d2835672a0d9298f82e4b4496b4f21cd5a581f849dcf' 
  AND token = '6SOEMJtiIdeu4NkfFxlz/e3HxpPgV3D62Fez1eguDQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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