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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f667e0ee87d1917e40c82b58b5bfc2d636e2868d961421d3d747d29e01719ea0' 
  AND token = 'EttyiIyZuTeTQ2G1G4H2CRozFgbXzc/vxRflsXWoWqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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