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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e762197c47b2fb0e2cad353b51359cf56266c0d5f44a34ad54fc6cabfccbe4f5' 
  AND token = 'pZPS2XJatz+IHL5rxDGHKILcR2Qh2+35CXK04o6JwdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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