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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0473e24405e4ac3b08f70c4746c1d13144031d86d16589847bc56f4ea3e23b0' 
  AND token = 'yiE1YKLrb8/vOUlgXY0UVpV7GabwnhnlTJXWCQMmiEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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