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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9552ec262d2d3f49205da66305edc6c2f492a83753b780bd31177d7dc44f1d79' 
  AND token = 'YbgEINngKfP6+dBkc9LdYz5cz7mFPqTRH2O/MewT90U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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