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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a38e4e57b75c749a33337ed8df71474f2ba88e1c9b757fac9ff19ec945b3567' 
  AND token = 'KEcyrS5s5B1Zt+GvKKZcL1Zezm3FJU0313sNNBGyI28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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