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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2b8c094c8d3066cc6bd62e9311c8ae8a49b9b2dcdf33a82d2ea0fc63c92c89' 
  AND token = 'gJUHeOYi6OcfynXKZh0rvbok9plQ+IOKCuUmR0N2pF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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