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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92af079df8f19fc041c2570b44de5fbabe99801043161ef4ae2f2256711d1e0' 
  AND token = '/xob9QcM9839V/vy4L1GOmRjDZym6vVMwdmXHsACYT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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