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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5abc67f972b4fda63a20fa7b7475d2f6b2d8267c2e3d71d1cdf9c08263d3dd' 
  AND token = 'XZM3xCD/al4bepNbaD51rgzY87e4sHDlDV/gokT098U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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