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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4a3d40419fdd9b9ce8dc153200f5fbcb02f7a611f3c25766a701f0ffb14a11' 
  AND token = '4fcizr/3WGX6fVFRd188vyebP/g+43mbVpHsLCmNRrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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