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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea653a12ee8891adf4e2d220a17e7ee3227e1c7c642c2a2fe1d3e20e919a0ef' 
  AND token = 'niXjbx3r/3dUhlSiOIJ1aSd7pZf6zqiBQKsZ9+nP710=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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