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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2e684b1e982f0d62d5e51b9e7b3fa1fe7296c953b020c90cb0c099e8d3315b' 
  AND token = 'U3OMKkM9uO3BNvBEk/JW22FNOEbouCagbaLxZ7yuvWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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