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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26faa0c165af2a2a422cf730e400916b681b687ab26ec7a7f22fcf4cb4482ff0' 
  AND token = 'G0/hv6TshC8kWJn8csoHv23mOeLDGF/VWB0GF92WWoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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