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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2e2b6b0f95dde0c1d2aaa8a2dc25ff81b5adc77966b1d000b07fdf0b55cc99' 
  AND token = 'G7L1dWpx8qu3fGhUECNQL2WXQjZRybT6oMLtIjiFiig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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