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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '912a74a06c49d5dfe573d679bb8176ef3f89c8041002751bd2a180febda34041' 
  AND token = 'NrjVSbi2QJLbV+mtrLAj0SNE4Xhd4BpwN2nz5+z+DmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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