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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8154dbc9cdcffc1cd5cd789dbc30a29c87892f7d7cbc19b8e509c4d3806f0f' 
  AND token = 'eG5wSgkRFAxZ1d/o2naKTR2q7Hta2lMoprZuGSxmIQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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