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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f796411b07c46249ff79915ab593600c3c7d9cba1686bb62298e5d73ab3f675c' 
  AND token = 'CTBeORL7d4pBwrsZQLM4HNArS9FEVqbQLN7236wjo0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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