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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e77e69a88e1188d45610de1e50c595d0b3c2f6a8592f8fc27c81a0551bb803' 
  AND token = 'V+03RQJ+vCvtxytPd9BpJSmUj3Qp9z+NevNKGE9H0Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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