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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ae4f1e73e05c5eea5077519f488dcc71fba3d704bd46e3bacc4c37a7c3f05c' 
  AND token = 'v2LlLum/Nqw5M+vdW+2vPzBU4K/UecdW+bbiiLfzQ3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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