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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a17ea0c3e7bd8e5d66a8a275fc563131021e32393b5e72cdccff289db65e77d' 
  AND token = 'JefDY6jVmFxdlCfd6Ty+sIV6kD+d+8wXfROI4gcmqtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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