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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664d2153e84bb874a3a5869a197b28eaf3f66ab31180c29f04e9c893765cbf1e' 
  AND token = 'tHFCm3sJ2c7yB28dN7Tl12Kf57ndiUO6ggVrw8hyezU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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