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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deec3887f8dc7906ef3e7672cbb059470b2d0cb0b33e1787fea49098e6865e70' 
  AND token = 'IrznfZkUDQur5K3Dv4rCi9g9qGmdBBMPAcrPL70oYvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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