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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab4b1b558dc73355b6584a9614a5f15d7d98b41875c708c25728510b33fae11' 
  AND token = 'EAD/biwdhpMGDRq09g9L7OwGLAmsDSH91Xwp0XCZB5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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