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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce3770b53e6b6174bed0e6e25f2dd33d1e3a96d60b4637f28458b2479427959' 
  AND token = 'rFRfFa6PUrjIqY3AFkR8IuaD52y9HSank4N9W3zQWXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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