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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397c6a85358beef80fb308af2d0617173cd12e2e9ee922077fe3230b3f960b99' 
  AND token = 'v20R+D+vt0TyQHi9ZiX2Rl88oOuo52WNVfI541/zqHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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