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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e588ee9f0a739ded83d3ea8e8fc0dd6f5f9e7651c000ff763c9bd2ddc708d6' 
  AND token = 'Bt4/qedN8PmnKgkrQdISrWQgnXnjUG+zt+eTUZysYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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